A brief on KakubanKakuban (1095-1143)Kakuban was a famous monk of the Shingon sect, a Japanese form of Esoteric Buddhism, similar to the Tantric Buddhism of Tibet. Kakuban founded Shingi Shingon sub-sect, and wrote the Amida Hishaku, an esoteric interpretation of the Pure Land teaching. He developed an esoteric interpretation of the Pure Land teaching. He believed that the central Buddha of Shingon devotion, Vairocana Buddha, and Amida Buddha were one and the same and that Their Pure Lands were also one and the same. He once wrote: “Amida is only another name for Vairocana, the Great Sun Buddha.

If a person will but repeat the three syllables of Amida’s Name, his bad karma that has been accumulating from time immemorial will be extinguished. Meditation upon the one Buddha Amida brings endless blessedness and wisdom. Amida is but an intellectual faculty of Vairocana, who is the substance of Amida’s person. Amida’s Pure Land is really everywhere, so that the place where we meditate upon Him is verily His own Land.

When we come to realize the truth of this, we do not need to leave this present fleeting world at all to get to the Pure Land - we are already there. And in our present bodies and persons, just as we are, we are assimilated to Amida, and he to Vairocana, from whom we derive our being. This is the path of meditation by which, just as we are, we attain Buddhahood.”

This equating of Vairocana and Amida was a radical step within the confines of Shingon doctrine, and as it was done to gain greater popular appeal among the masses, it shows the basic popularity which Pure Land ideas had gained by this time. Kakuban's fellow Shingon monk, Saisen (1025-1115), also wrote extensively on the Pure Land teachings.

All beings since their first aspiration till the attainment of Buddhahood are sheltered under the guardianship of Buddhas and Bodhisattvas who, responding to the requirements of the occasion, transform themselves and assume the actual forms of personality.

Thus for the sake of all beings Buddhas and Bodhisattvas become sometimes their parents, sometimes their wives and children, sometimes their kinsmen, sometimes their servants, sometimes their friends, sometimes their enemies, sometimes reveal themselves as devas or in some other forms.

in The Amitayurdhyana Sutra(觀無量壽經), Amitaba buddha is regarded the core of universe,(dharma body) already. that sutra is teaching Chanting or invocation with the insight of the true nature of self and reality of the universe(實相念佛)。